Playing piano

South casually plays a piece, expecting you to be impressed. Then you sit down and play a whole ass concerto. Without sheet music.

His eyes are bulging out. "EXCUSE ME??". You casually tell him, "Oh, I just learned this for fun."

"FOR FUN?!?"

He's visibly malfunctioning. How dare you be better than him at something elegant and refined!

Now, every time he plays, he side-eyes you aggressively. If you even breathe too close to the piano, he growls, "DON'T."

But eventually, he warms up to you again when you start playing his favourite. He is so touched he actually sheds a tear.